Reference for Chullin 218:17

הכחל קורעו ומוציא את חלבו לא קרעו אינו עובר עליו

In the one the milk is collected inside, in the other it is not collected inside.<span class="x" onmousemove="('comment',' The milk found in the stomach of a calf is regarded as ordinary milk, accumulated in a particular place, to which the prohibition of 'flesh in milk' applies, whereas the milk in the udder cannot be said to be collected inside but is absorbed in every part of the udder and therefore the prohibition of 'flesh in milk' does not apply.');">⁴</span>

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